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A roll-over valve attaches over an existing carburetor float bowl vent tube and closes when a car is involved in a crash to prevent or reduce fuel from escaping from a tilted or inverted carburetor and starting a fire. Carburetors are used in many special interest cars and race cars. The carburetors

A roll-over valve attaches over an existing carburetor float bowl vent tube and closes when a car is involved in a crash to prevent or reduce fuel from escaping from a tilted or inverted carburetor and starting a fire. Carburetors are used in many special interest cars and race cars. The carburetors include float bowls containing fuel and the float bowls are vented to outside air by the carburetor vent tubes. The carburetor vent tubes are generally vertical tubes reaching upward from the carburetor into an air cleaner or the volume above the carburetor. The roll-over valve includes a compression fitting or other connector and is easily fitted to the carburetor.

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1. A carburetor and roll-over valve comprising: a carburetor having at least one float bowl containing fuel;a cylindrical vertical vent tube extending upward from the carburetor and in fluid communication with the respective at least one float bowl;a roll-over valve fixed to the vent tube, the roll-

1. A carburetor and roll-over valve comprising: a carburetor having at least one float bowl containing fuel;a cylindrical vertical vent tube extending upward from the carburetor and in fluid communication with the respective at least one float bowl;a roll-over valve fixed to the vent tube, the roll-over valve comprising: a compression fitting for forming a seal to the vent tube;a vertical centered passage though the roll-over valve;an inside shoulder forming a narrowing of the vertical centered passage;a vertically sliding obstruction residing inside the vertical centered passage and residing above the inside shoulder;bypass cuts in the vertical centered passage allowing air to flow past the vertically sliding obstruction into and out of the float bowl to equalize pressure in the float bowl with ambient air pressure when the carburetor is upright;a port above the vertical centered passage in communication with ambient air; anda narrowing between the vertical centered passage and the port to block passage of the vertically sliding obstruction into the port and to cooperate with the vertically sliding obstruction to restrict an escape of fuel from the float bowl when the carburetor is inverted. 2. The carburetor and roll-over valve of claim 1, wherein the inside shoulder is above the compression fitting. 3. The carburetor and roll-over valve of claim 1, wherein the vertically sliding obstruction is spherical in shape. 4. The carburetor and roll-over valve of claim 1, wherein the port extends vertically above the vertical centered passage. 5. The carburetor and roll-over valve of claim 4, wherein the narrowing between the vertical centered passage and the port is a frusto-conical narrowing. 6. The carburetor and roll-over valve of claim 4, wherein the port extends vertically and then bends and extends below horizontal to an exterior surface of the roll-over valve. 7. The carburetor and roll-over valve of claim 4, wherein the port extends vertically and then bends and extends horizontal to an exterior surface of the roll-over valve. 8. The carburetor and roll-over valve of claim 4, wherein the port extends vertically and extends above the roll-over valve forming a barbed hose fitting for connection to a hose carrying any escaping fuel to a container. 9. The carburetor and roll-over valve of claim 1, wherein the vertically sliding obstruction is a light weight material for use in off-road and water vehicles. 10. The carburetor and roll-over valve of claim 1, wherein the vertically sliding obstruction is a ceramic material for use when fires are likely. 11. A carburetor and roll-over valve comprising: a carburetor having at least one float bowl containing fuel;a cylindrical vertical float bowl vent tube extending upward from the carburetor and in fluid communication with the respective at least one float bowl;a roll-over valve fixed to the vent tube, the roll-over valve comprising: a compression fitting nut;a compression fitting wedge;a body portion comprising: a lower male threaded portion threadedly cooperating with the compression fitting nut to squeeze the compression fitting wedge radially to fix the roll-over valve on the vent tube;a center portion having an outside surface for cooperating with a tool;an upper male threaded portion;a vertical centered passage though the body portion;an inside shoulder forming a narrowing of the vertical centered passage;a vertically sliding obstruction residing inside the vertical centered passage and residing above the inside shoulder; andbypass cuts in the vertical centered passage allowing air to flow past the vertically sliding obstruction into and out of the float bowl to equalize pressure in the float bowl with ambient air pressure when the carburetor is upright;a top cap comprising: a cap lower portion having female threads for threadedly cooperating with the upper male threaded portion of the body portion;a port above the vertical centered passage in communication with ambient air; anda narrowing between the cap lower portion and the port to block passage of the vertically sliding obstruction into the port and to restrict an escape of fuel from the float bowl when the carburetor is inverted. 12. A carburetor and roll-over valve comprising: a carburetor having at least one float bowl containing fuel;a vertical vent passage extending upward from the carburetor and in fluid communication with the respective at least one float bowl;a roll-over valve connected serially with the vent tube wherein all of a flow through the vent tube is restricted to also pass through the roll-over valve, the roll-over valve comprising: a vertical centered passage though the roll-over valve;an inside shoulder forming a narrowing of the vertical centered passage;a vertically sliding obstruction residing inside the vertical centered passage and residing above the inside shoulder;bypass cuts in the vertical centered passage allowing air to flow past the vertically sliding obstruction into and out of the float bowl to equalize pressure in the float bowl with ambient air pressure when the carburetor is upright;a port above the vertical centered passage in communication with ambient air; anda narrowing between the vertical centered passage and the port to block passage of the vertically sliding obstruction into the port and to cooperate with the vertically sliding obstruction to restrict an escape of fuel from the float bowl when the carburetor is sufficiently tilted. 13. The carburetor and roll-over valve of claim 12, wherein the vent tube is an integral float bowl vent formed in a choke housing of the carburetor and the roll-over valve is connected to the integral float bowl vent by a float bowl vent extension connected to the integral float bowl vent and by a compression fitting in a lower portion of the roll-over valve. 14. The carburetor and roll-over valve of claim 12, wherein the vent tube is an integral float bowl vent formed in a choke housing of the carburetor and a choke housing of the carburetor is machined to allow the roll-over valve to be connected to an exposed portion of the integral float bowl vent by a compression fitting in a lower portion of the roll-over valve.